Make WebURLLoader capable of retaining received buffers.

content/child/ref_counted_shared_memory.cc

Index: content/child/ref_counted_shared_memory.cc
diff --git a/content/child/ref_counted_shared_memory.cc b/content/child/ref_counted_shared_memory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..cad1b0c27102c8e4a0535cdab0a8d18fd411cdb3
--- /dev/null
+++ b/content/child/ref_counted_shared_memory.cc
@@ -0,0 +1,17 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/child/ref_counted_shared_memory.h"
+
+namespace content {
+
+RefCountedSharedMemory::RefCountedSharedMemory(base::SharedMemoryHandle handle,
+                                               bool read_only)
+    : memory_(handle, read_only) {
+}
+
+RefCountedSharedMemory::~RefCountedSharedMemory() {
+}
+
+}  // namespace content